NEW YORK (AP) — Michael J. Fox has been living with “Back to the Future” for a long time. “I’ll be on the street and some kid will go, ‘There’s Marty McFly!’” Fox says. “No, this is an old man.” It’s been 40 years since “Back to the Future” debuted in theaters, but neither time, nor Parkinson’s disease has done much — regardless of what he says — to diminish Fox’s boyish good nature. For Fox, traveling through time with “Back to the Future” has been part of life. It’s the film that strapped a